package main

import "fmt"

func main() {

	nums := []int{1, 2, 3, 4}
	sum := 0
	for _, num := range nums {
		sum += num
	}
	fmt.Println(sum)


	for i,num := range nums{
		fmt.Println(i,"=>",num)
		if num == 3{
			fmt.Println("index",i)
		}
	}

	kvs := map[string]string{"a":"apple","b":"banana"}
	for k,v := range kvs{
		fmt.Printf("%s->%s\n",k,v)
	}


	for k:=range kvs{
		fmt.Println(k)
	}

	for i,c:=range "go"{
		fmt.Println(i,c)
	}
}
